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i need to replace it with 243. Also, it is a part of an awk script so need to use awk alone. Need some generalized script to specify the substring at a certain position alone in a line.

Hi.. I have a file that has the following content :
abc 213 24 213
pqr 456#34 678
xyz 213 45%213

i need to write an awk script that will replace the second 213 in all the lines, if it is...